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Esp32Uart2

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https://docs.micropython.org/en/latest/esp32/quickref.html

#
PIN_UART0_TX =  1 # USB
PIN_UART0_RX =  3 # USB
#
PIN_UART1_RX = 25 #  9 - not usable 
PIN_UART1_TX = 26 # 10 - not usable 
#
PIN_UART2_RX = 16
PIN_UART2_TX = 17
#

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